diff --git a/lucene/core/src/test/org/apache/lucene/search/BaseKnnVectorQueryTestCase.java b/lucene/core/src/test/org/apache/lucene/search/BaseKnnVectorQueryTestCase.java
index 35be67fd7ba..d54db77c739 100644
--- a/lucene/core/src/test/org/apache/lucene/search/BaseKnnVectorQueryTestCase.java
+++ b/lucene/core/src/test/org/apache/lucene/search/BaseKnnVectorQueryTestCase.java
@@ -792,6 +792,15 @@ abstract class BaseKnnVectorQueryTestCase extends LuceneTestCase {
     assertEquals(expectedId, actualId);
   }
 
+  void assertDocScoreQueryToString(Query query) {
+    String queryString = query.toString("ignored");
+    // The string should contain matching docIds and their score.
+    // Since a forceMerge could occur in this test, we must not assert that a specific doc_id is
+    // matched
+    // But that instead the string format is expected and that the score is 1.0
+    assertTrue(queryString.matches("DocAndScoreQuery\\[\\d+,...]\\[1.0,...]"));
+  }
+
   /**
    * A version of {@link AbstractKnnVectorQuery} that throws an error when an exact search is run.
    * This allows us to check what search strategy is being used.
diff --git a/lucene/core/src/test/org/apache/lucene/search/TestKnnByteVectorQuery.java b/lucene/core/src/test/org/apache/lucene/search/TestKnnByteVectorQuery.java
index 33c8ebee293..8badf34f2bb 100644
--- a/lucene/core/src/test/org/apache/lucene/search/TestKnnByteVectorQuery.java
+++ b/lucene/core/src/test/org/apache/lucene/search/TestKnnByteVectorQuery.java
@@ -76,8 +76,7 @@ public class TestKnnByteVectorQuery extends BaseKnnVectorQueryTestCase {
       AbstractKnnVectorQuery query = getKnnVectorQuery("field", new float[] {0, 1}, 10);
       assertEquals("KnnByteVectorQuery:field[0,...][10]", query.toString("ignored"));
 
-      Query rewritten = query.rewrite(newSearcher(reader));
-      assertEquals("DocAndScoreQuery[0,...][1.0,...]", rewritten.toString("ignored"));
+      assertDocScoreQueryToString(query.rewrite(newSearcher(reader)));
     }
   }
 
diff --git a/lucene/core/src/test/org/apache/lucene/search/TestKnnFloatVectorQuery.java b/lucene/core/src/test/org/apache/lucene/search/TestKnnFloatVectorQuery.java
index 15b7f624610..325b65ef9b2 100644
--- a/lucene/core/src/test/org/apache/lucene/search/TestKnnFloatVectorQuery.java
+++ b/lucene/core/src/test/org/apache/lucene/search/TestKnnFloatVectorQuery.java
@@ -75,8 +75,7 @@ public class TestKnnFloatVectorQuery extends BaseKnnVectorQueryTestCase {
       AbstractKnnVectorQuery query = getKnnVectorQuery("field", new float[] {0.0f, 1.0f}, 10);
       assertEquals("KnnFloatVectorQuery:field[0.0,...][10]", query.toString("ignored"));
 
-      Query rewritten = query.rewrite(newSearcher(reader));
-      assertEquals("DocAndScoreQuery[0,...][1.0,...]", rewritten.toString("ignored"));
+      assertDocScoreQueryToString(query.rewrite(newSearcher(reader)));
     }
   }